γ-Al_2O_3系催化剂在苯酚氨化反应中催化性能的研究

以Al_2(SO_4)_3和Al(NO_3)_3、NaAlO_2为原料,制得无Na~+的γ-Al_2O_3(Ⅰ)和含Na~+的γ-Al_2O_3(Ⅱ)。用程序升温脱附技术研究了两者的表面性质,以及用盐酸浸渍对它们表面性质和催化活性的影响。Ⅰ表面上存在L酸中心,Ⅱ表面上存在两类强弱不同的吸附中心;Na~+的存在对表面酸度肯有抑制作用,从而使催化活性下降。当用一定浓度的酸浸渍后,Ⅰ,Ⅱ表面均出现了强度更高的一类新的吸附中心——质子酸中心,並使催化活性得到很大提高。HCI浓度为1.2(wt)%时,活性最高。     

MIS网络化中的几个技术问题

随着计算机技术特别是网络技术的飞速发展,要使传统意义下的ＭＩＳ系统能够在网络环境下运行,就必须对原有ＭＩＳ系统网络化。这一问题是当今计算机界重要的热点问题。文中介绍了客户／服务器方式、浏览／服务器方式的体系结构问题;多机操作时,数据的独立性、一致性和唯一性问题;以及系统的安全机制及实现等技术问题     

浔商伦理及其现实价值考量

肯定了浔商在长期经商实践中形成的商业伦理曾在其迅速崛起过程中发挥的重要的作用。指出浔商伦理作为封建社会的产物,具有一定的历史局限性,但其要义精髓对于市场经济依然具有适用性和可借鉴性。针对当前我国市场经济建设中信用缺失、道德失范等问题,关注并研究浔商伦理具有积极的现实意义。     

Bi掺杂的直接甲醇燃料电池阳极催化剂研究进展

发展可替代能源对缓解全球能源问题具有重要意义。直接甲醇燃料电池(direct methanol fuel cell,DMFC) 因其工作温度低、能量密度高以及污染物排放少等特性,正逐渐成为最有发展前景的便携式能源技术之一。目前,其商业化进程主要取决于甲醇氧化反应(methanol oxidation reaction,MOR) 的动力学快慢、催化剂的成本和寿命。Bi元素的掺杂可以极大地提高甲醇电催化氧化的性能,并且可以提高阳极催化剂抵抗CO中毒的能力。介绍了掺杂Bi的贵金属和非贵金属阳极电催化剂,以及贵金属掺杂Bi₂O₃、Bi₂WO₆ 等光辅助电催化剂;综述了它们提高甲醇电催化氧化性能的机制,并展望了阳极Bi电催化剂在DMFC中所面临的机遇和挑战。     

不同无土栽培方式及其对蔬菜品质影响的研究进展

随着生活水平的提高,市场对蔬菜需求量、品质和安全性都提出更高的要求.蔬菜设施栽培方式应运而生,使蔬菜栽培类型逐步由单一的传统露地土壤栽培向基质栽培、水培和雾培等多元化栽培方式发展,蔬菜生产业发展迅速,在种植业中占据了重要分量.概述了近年来国内外在蔬菜种植过程中所选用的栽培方式,及其对蔬菜品质的影响,为发展和完善本地蔬菜的种植和栽培渠道提供有效的参考.     

三聚氰胺甲醛树脂对金的吸附行为

研究了在不同酸性介质（硝酸、硫酸、盐酸）中，三聚氰胺甲醛树脂（蜜胺树脂）对金的吸附行为及其影响因素，结果表明，在酸性介质中，该树脂对金有较高的吸附率（达８０％以上）和好的选择性，并对其吸附机理进行了初步的探讨。     

视频金相显微镜改制

普通光学金相显微镜只能通过目镜观察金相组织。将光学信号转换为视频信号,在显示屏上观 察金相组织,以方便教学和研究。     

Kato-Katz法检查血吸虫卵漏检分析

本文主要讨论用Kato-Katz法检查血吸虫卵时存在的漏检问题,探究Kato-Katz法在不同感染度下和片数条件下血吸虫卵的检出规律性。     

Study and application on the evaluation method of porous formation for long term waterflooding sand reservoir

Nine targets which stand both for the static characteristic of produced formations and the dynamic parameter of wells including the average permeability,variation coefficient of permeability,moving capability,remaining recoverable reserves,coefficient of flooding,daily oil production,increasing rate of water cut,cumulative liquid production per unit meter and efficiency index of oil production are selected as the evaluation indexes,a novel model to evaluate the porous formations in long-term waterflooding sand reservoir was established by using the support vector machine and clustering analysis. Data of 57 wells from Shentuo 21 block Shengli oilfield was analyzed by using the model. Four kinds of formation groups were gained. According to the analysis result,different adjustment solutions were put forward to develop the relevant formations. The Monthly oil production increased 7.6 % and the water cut decreased 8.9 % after the adjusted solutions. Good results indicate that the learning from this method gained will be valuable adding to other long-term waterflooding sand reservoirs in Shengli oilfield and other similar reservoirs worldwide.     

A simplified approach to the global seismic hazard assessment

Some earthquakes in recent years (such as Tangshan earthquake (1976, China), North Ridge earthquake (1994, USA), Kobe earthquake (1995, Japan)) did not occur in known faults; moreover, the detailed data of geology, earthquake, crust deformation, etc. needed by the fault model are very difficult to obtain in many regions of the world. A simplified method of global seismic hazard analysis is developed, based on an area source model and by using seismicity data, and the global seismic hazard map is compiled. To evaluate the effectiveness and credibility of the new method, comparison study of this map with the existing national maps has been performed, which implies that it is considerably valuable to apply this method to practical use.